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Java some tip about SSL in java

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junv
2018-11-05 12:07:29 +11:00
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@@ -178,3 +178,12 @@ In short no need add manual `finally` block to close resources.
- A selector allows a single thread to handle multiple Channels
- [http://tutorials.jenkov.com/java-nio/index.html](http://tutorials.jenkov.com/java-nio/index.html)
### SSL
#### Java use TLSv1.2 by default since Java 8
When you saw some error like this `SSL handshake exception: “Algorithm constraints check failed: MD5withRSA”`, probably you used `MD5` as message digest when generate a CA. You should regenerate a new CA using `sha1`, because the `MD5` has been found to be insecure.
Some more info <https://stackoverflow.com/questions/21218217/ssl-handshake-exception-algorithm-constraints-check-failed-md5withrsa>